Antenna chassis



FIG. 1 is a perspective view of the front, right and top of an antenna chassis showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom view thereof.

In the drawings, the broken lines depict environmental subject matter only and form no part of the claimed design. 

The ornamental design for an antenna chassis, as shown and described. 